Metrology Glossary: Ammeter

What Is an Ammeter?

An ammeter is a device to measure electric current in circuits, for both DC and AC. There are two types of ammeters. Moving coil ammeters, which uses a magnet-induced coil deflection to measure current, and hot-wire ammeters, which gauges current through wire heating. In moving coil ammeters, current deflects a suspended wire coil amidst magnetic poles, the deflection reflecting current magnitude. Hot-wire ammeters rely on a heated wire; the heat’s proportion to current heats the wire and moves an attached pointer, indicating current strength.

Where Are Ammeters Used?

Ammeters are versatile instruments applied in measuring current flow within electrical circuits, ensuring safe and efficient operation. They play a pivotal role in troubleshooting electrical issues by identifying and isolating faults. Ammeters also monitor the performance of equipment such as motors and generators by gauging current draw. Additionally, they contribute to precision by calibrating other electrical instruments such as voltmeters. In essence, these instruments serve a vital role in various applications, guaranteeing the efficiency, safety, and reliability of electrical systems and equipment.